1887
Volume 16 Number 2
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

ABSTRACT

We show the effectiveness of forward and inversion modelling of high‐resolution magnetic data in deciphering the geological framework in a polydeformed Proterozoic Kaladgi basin. The Meso to Neo Proterozoic Kaladgi basin exposes platformal sediments in the northern margin of Dharwar Craton, Peninsular India. The study of high‐resolution magnetic data over Deshnur locality suggests two prominent trends NW–SE and NE–SW, followed by two minor trends of E–W and N–S. Analysis of the magnetic anomalies aided in understanding the succession of deformation events and their impact over sedimentation. The NW–SE trending Nalur shear zone marks the western contact between the Chitradurga Schist belt and Peninsular gneisses that are traced beneath the Badami sediments. The forward model suggests that the NE–SW trending block faulting resulted in generating a series of Horst and Graben structures. Three‐dimensional compact inversion of circular features bearing remanent magnetisation indicates elliptical‐shaped pipe‐like bodies. The three‐dimensional inversion of magnetic data implied thicker sediments within these Graben structures. The basement configuration depicted as elevation of magnetic basement corroborates these three‐dimensional inversion results. The derived results are validated by drill holes, and the intercepts substantiate the inferred structural setup over the study area. Available drill hole and magnetic data interpretation are combined with field information to reconstruct the tectonostratigraphy and the architecture of the Kaladgi basin around Deshnur locality.

Loading

Article metrics loading...

/content/journals/10.3997/1873-0604.2017047
2017-09-01
2020-04-09
Loading full text...

Full text loading...

References

  1. AitkenA.R.A. and BettsP.G.2009. Multi‐scale integrated structural and aeromagnetic analysis to guide tectonic models: an example from the eastern Musgrave Province, Central Australia.Tectonophysics476, 418–435.
    [Google Scholar]
  2. AnandS.P. and RajaramM.2002. Aeromagnetic data to probe the Dharwar craton.Current Science83(2), 162–167
    [Google Scholar]
  3. BettsP.G., ValentaR.K. and FinlayJ.2003. Evolution of the Mount Woods Inlier, northern Gawler Craton, southern Australia: an integrated structural and aeromagnetic analysis.Tectonophysics366, 83–111.
    [Google Scholar]
  4. BoseP.K., SarkarS., MukhopadhyayS., SahaB. and ErikssonP.2008. Precambrian basin‐margin fan deposits: Mesoproterozoic Bagalkot Group, India.Precambrian Research162, 264–283.
    [Google Scholar]
  5. GrauchV.J.S., RodriguezB.D. and BankeyV.2003. Evidence for a Battle Mountain‐Eureka crustal fault zone, north‐central Nevada, and its relation to Neo Proterozoic‐Early Paleozoic continental breakup.Journal of Geophysical Research108(B3), 2140.
    [Google Scholar]
  6. HelbigK.1963. Some integrals of magnetic anomalies and their relation to the parameters of the disturbing body.Zeitschrift für Geophysik29(2), 83–96.
    [Google Scholar]
  7. JayaprakashA.V., SundaramV., HansS.K. and MishraR.N.1987. Geology of the Kaladgi‐Badami Basin, Karnataka. Geological Survey of India, Bangalore, 201–225.
    [Google Scholar]
  8. JohnsonP.R. and StewartI.C.F.1995. Magnetically inferred basement structure in central Saudi Arabia.Tectonophysics245, 37–52.
    [Google Scholar]
  9. KuC. and SharpJ.A.1983. Werner deconvolution for automated magnetic interpretation and its refinement using Marquardt‘s inverse modelling.Geophysics48, 754–774
    [Google Scholar]
  10. LiY. and OldenburgD.W.1996. 3D inversion of magnetic data.Geophysics61(2), 394–408.
    [Google Scholar]
  11. LiY. and OldenburgD.W.2003. Fast inversion of large‐scale magnetic data using wavelet transforms and a logarithmic barrier method.Geophysical Journal International152 (2), 251–265.
    [Google Scholar]
  12. McLeanM.A., WilsonC.J.L., BogerS.D., BettsP.G., RawlingT.J. and DamaskeD.2009. Basement interpretations from airborne magnetic and gravity data over the Lambert Rift region of East Antarctica.Journal of Geophysical Research: Solid Earth114, B06101.
    [Google Scholar]
  13. PrevecL. and MorrisW.A.2001. Enhanced resolution of geological structures from magnetic data: an example from the Abitibi Greenstone Belt of Northern Ontario.Canadian Journal of Earth Sciences38, 963–974.
    [Google Scholar]
  14. SchmidtP.W. and ClarkD.A.1998. The calculation of magnetic components and moments from TMI: a case study from the Tuckers igneous complex, Queensland.Exploration Geophysics29, 609–614.
    [Google Scholar]
  15. SridharM., ChaturvediA.K. and RaiA.K.2014. Locating new uranium occurrence by integrated weighted analysis in Kaladgi Basin, Karnataka.Journal of Geological Society of India84, 509–512.
    [Google Scholar]
  16. StewartJ.R. and BettsP.G.2010. Late Paleo‐Mesoproterozoic plate margin deformation in the southern Gawler Craton: insights from structural and aeromagnetic analysis.Precambrian Research177, 55–72.
    [Google Scholar]
  17. SwainC.J.1976. A FOTRAN IV program for interpolating irregularly spaced data using the difference equations for minimum curvature.Computers & Geosciences1, 231–240.
    [Google Scholar]
  18. TalwaniM. and EwingM.1960. Rapid computation of gravitational attraction of three‐dimensional bodies of arbitrary shape.Geophysics25, 203–225.
    [Google Scholar]
  19. WennerstromM. and AiroM.L.1998. Magnetic fabric and emplacement of the post‐collisional Pomovaara Granitic Complex in northern Fennoscandia.Lithos45, 131–145.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.3997/1873-0604.2017047
Loading
/content/journals/10.3997/1873-0604.2017047
Loading

Data & Media loading...

  • Article Type: Research Article
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error